Varnish and paint removing compound



Patented Jan. 24, 1928.

uNrrED STATES FLORENCE H. BRAINARD, OF LONE ROCK, WISCONSIN.

VARNISH AND IPAINT REMOVING COMP OUND.

No Drawing.

making the same.

The object of this invention is to provide a more eflicient compositionof this kind which can be economically manufactured, which does notevaporate rapidly or deteriorate through exposure to the air, which willadhere to surfaces in any position, which will not injure or discolorthe hands and which may be stored or handled without danger.

The composition of my invention comprises water, a non-caustic alkali,an acid and sodium silicate or other suitable starchy or gelatinousorganic substance.

In preparing the compound, I proceed for example as follows:

Two pounds of carbonate of soda are dissolved in ten quarts of water andallowed to stand twelve hours after which one ounce of citric acid isadded and when eti'ervescing has ceased seven quarts of liquid orsoluble glass such as sodium or a similar silicate are added and thewhole thoroughly mixed. No heat is to be employed in the preparation.

The resultant compound is then ready for use and may be applied to thesurface to be treated with a brush or cloth or in any other' suitablemanner; The surface may be preliminarily dampened to expedite the actionof the compound, but-this is not essential. After the remover has stooduntil the paint or varnish on the surface has been absorbed it is washedor wiped off, leaving the surface in its original state, clean,uncolored and unaffected either by the coating or by the remover.

The compound if covered will keep indefinitely without deterioration dueto the presence of citric acid or citrate. Because of the absence ofcausticity since sodium carbonate is used in place of caustic alkali itwill be .found not to be harsh or injurious to the hands Due to itsadhesive characteristics resultlng from the use of the silicate it ispossible to treat all of the sides of an article- Application filedMarch 1, 1923. Serial No. 622,227.

at once, thus greatly reducing the time heretofore required to removecoatings in this fashion.

IVhile I have specified in the foregoing example what I consider to bethe preferred ingredients, proportions and method ofpreparation, I donot thereby intend to suggest that the invention is limited to precisede tails as obviously the advantages pointed out may be attained inother and various ways, all within the contemplation of the invention asset forth in the following claims.

Sodium citrate, for which can be substituted any other organic acidsalts such as tartrate, niucate, lactate and benzoate, has the effect ofpreventing deterioration of the sodium silicate upon standing, thisdeterioration being principally due to the thickening and gelatinizationof the silicate. It can be said that the citric acid or the citrate orother similar organic salts act in a manner as thinning agents and makethe solution more workable. The sodium carbonate is for the purpose ofadding a non-caustic alkalinity to the solution of the paint remover,but it is obvious that any other alkaline material, for example thetri-sodium phosphate, sodium borate, potassium carbonate, etc. couldalso be used. All these compounds have suflicient-alkalinity to beeffective in the paint remover, but are insufti ciently alkaline to beharsh or injurious to the hands. It will be noted from the abovespecification that the varnish and paint removing compound is composedof a noncaustic alkaline material in solution with a silicate or asimilar gelatinous material, which will enable a paint remover to beapplied to vertical surfaces, and at the same timea stabilizer such as acitrate or other organic salt is added to maintain the silicate'inpermanent-1y workable condition and of constant consistency.

I claim:

1. A compound for removing paint, varnish or similar coatings,consisting of a mix-' ture of water, a noncaustic alkali and sodiumsilicate to which has been added an alkali .I'netal citrate asastabilizer.

v 2. A compound for removing paint, varorganic salt as a stabilizer forthe sodium 10 nish or similar coatings, consisting of a mixsilicate;ture of 10 quarts of water, 2 pounds of so- 4. A compound for removingpaint, vardium carbonate and 7 quarts of sodium silinish, orsimilar'coatings,consisting of a mix- 5 cate, to which has been addedone ounce of ture of Water, alkali metal carbonate, alkali citric acid.metal citrate and sodium silicate.

3. A compound for removing paint, var- In testimony whereof I havehereunto subnish or similar coatings, consisting of water, scribed myname. 1 non-caustic alkali, sodium, silicate, and an FLORENCE H.BRAINARD I CERTIFIQATE or CORRECTION. Patent No. 1,657,147, GrantedJanuary 24-; 1928, to

' FLORENCE u. BRAINARD.

It is hereby certified that error appears in the printed specificationof the above numbered patent requiring correction as follows: Page 2,line 15, claim 4, I

strike out the word "sodium" and insert instead "alkali metal"; and thatthe saidLetters Patent should be read with this correction therein thatthe same may conform to the record of the case in the/Patent Office.

Signed and sealed this 27th day of March, A, D. 1928.

M. J; Moore, I

Seal. Acting Commissioner of 'Patentl.

